Abstract
<p style="text-align: justify;"><strong>Background and Aims:</strong></p><p style="text-align: justify;">Grape yields show distinct interannual fluctuations caused by environmental conditions. Statistical investigations based on a 22-year data set (1993-2015) of annual yields of two grape cultivars grown in Luxembourg aimed at (i) investigating the impact of meteorological conditions during specific phases of yield formation, (ii) identifying meteorological conditions with predictive value for annual grape yield, and (iii) developing models to simulate yield based on meteorological data.</p><p class="Tabelle" style="text-align: justify;"><strong>Methods and Results:</strong></p><p class="Tabelle" style="text-align: justify;">Window pane analysis showed that pre-bloom and bloom minimum temperatures and precipitation sums in the preceding year, winter temperatures, spring temperatures, and post-veraison minimum temperatures in the current year were positively correlated with annual yield; early spring and post-harvest temperatures in the preceding year, and, for Riesling, pre-bloom precipitation sums and post-bloom maximum temperatures in the current year were negatively correlated with annual yield. Models developed from these data simulated annual yield with high accuracy (R<sup>2</sup><sub>adj</sub> = 0.88 for Riesling, and R<sup>2</sup><sub>adj</sub> = 0.92 for Müller-Thurgau).</p><p class="Tabelle" style="text-align: justify;"><strong>Conclusions:</strong></p><p style="text-align: justify;">Meteorological conditions during distinct periods of yield formation are correlated with annual yield. Yield models can be used in practical viticulture as well as in climate change impact studies.</p><p class="Tabelle" style="text-align: justify;"><strong>Significance of the study:</strong></p><p class="Tabelle" style="text-align: justify;">Enhanced understanding of the effects of meteorological conditions during specific periods of yield formation supports growers’ efforts to optimize viticultural measures aimed at achieving adequate yield levels.</p>
Highlights
University of Natural Resources and Life Sciences, Department of Crop Sciences, Division of Viticulture and Pomology, Konrad Lorenz Str. 24, A-3430 Tulln, Austria
Budbreak (BBCH 09) on average occurred on day of year (DOY) 116
The yield models developed here are based on meteorological conditions that occur within time windows identified by window pane analysis and that are significantly correlated with annual yields
Summary
The objective of the present study was to use this statistical approach to detect critical time windows for the formation of annual crop yields in wine grapes
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